What is god sister?

As an AI language model, I cannot guarantee that I can give information about God sister because God sister is not a universal concept and it depends on how different individuals and cultures understand the term. However, the term "god sister" may refer to a female friend who is equally close to a person, just as a godparent may be to a child. It is a phrase commonly used in English-speaking communities in the Caribbean and the South and refers to a close friendship that formed during a baptism or christening ceremony where the godparents of the child became godparents to each other's children. The relationship is recognized as familial and considered just as important as blood ties.